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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597e0fc967b4a7d0c4b24a74f4cf165b2543af2d61959b81cc307cc2b67eb473' 
  AND token = '0NQJrLAcCrOaAauJPsdS0Q6uge5+IHRdBZJY0BOYMso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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