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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba4c45f97b812ba3a37571a0741664a3624d0af66787843cb4dca35bf5af8d6' 
  AND token = 'atSr0Q2rNgYw+aBRPdfiiHpNP6vVH4pcOjfyXKEMLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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