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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a1baeacf22ef8412be4642fb20ff1a817f65e929877300a63f6c928d8e2859' 
  AND token = '4W83FCtbv/J1quMFPoT6XAiTXaIaS5IN59/ryQ6f5Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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