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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410fb7451d2f6ac288d92f044cfbc8c8f53bf07556bc7037976aec786416db6d' 
  AND token = '3olBjsrml6XyphM8S9IEW/yjb/5USzdzEc0hwdy9T4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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