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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8079d113d95249afe5d94d2218dbd8199850010a1a00a6e6a420eab9a8b416b' 
  AND token = 'dnDi4KvMODXD7FCU9g3j5+75wJfCivePrMHTzvB9ISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}