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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5567dbee11b2d563a6de989773f96bfcde810c5c29ed7866e7d73a628a3aa513' 
  AND token = 'd2XRZc6rqf36FY8SETxSn+d2AqUpzVLq92WlouOC1Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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