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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0175f692aaa74484bbd228a3c3c71f0d5b27d55bb5511a6d94ffb86c01f3b9' 
  AND token = 'yP84h2iXZ+mfXRNX3vU+qv2WqQ1WFKJubFSJtSOTteo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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