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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3a6221825c2cc4cf5d566c28465ec2d328007a657a63bed1118126445237f0' 
  AND token = 'fFsCacGQxlhRGT4gP8Zx2t/xIa6fEXd0ts3YBXFNc5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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