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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd828a786122860b50f288f444dc2b2eeb000a4a2aa34da0fb2e10dc7afe958c3' 
  AND token = 'p57jEgxdXLwNCOP8zOKv0Ns83vWGphIB92J74057kvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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