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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336988125ce21558e5720e7262334376f57b1c6add530c2553d7cadf83274fb8' 
  AND token = '8dMNRoyGp+uTyYJbIfMXl4dZ0S3GqEssgcrAnhlkNPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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