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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3935df0938029160ec2f4590e9b2219822bcc3a37d21e971834cda23a74550ec' 
  AND token = 'ylZxDobKu/Lk9HJq06uqeqde+bSA4lzYLQgLFX1wQvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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