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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed56b47e39959dcf684ce2b640941801c27947a50ce85cd243495b3a4d134658' 
  AND token = 'RD84rKt1OcpLQ/v55F+hZ+k9MS994ov0XrcUdcju3Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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