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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfe08eeb42783c4f1a65e6783d839e8ecf99ef9cd7f9c84b9b6aeb3a8bafdaa' 
  AND token = 'ieqOsZcodfzItKXIXwQT4VTkN2KpMvx4tNsaC2Nohwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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