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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828dce07917dd22e72fa6f71da30f001a184cdb18d1394c1bb55b94e28275d1d' 
  AND token = 'O7gmyNeCZRa9ThPFtxa25ALmKVQf2fPFU9fdSWQGd48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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