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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d96e55f2ee4a7d99415c304ad8a517acbbdbc5acb8f5a2e90869c07af06c77' 
  AND token = 'kiM5QDlN9mQzKY4aABhqzsd4d/WT6iNk1m/tfh89B+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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