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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f133496b8e258d94a68a18c994b037b5bd55526438976789c78d02f5097669f' 
  AND token = 'U6eQU/dEKU66tBHtA+gJw83xW5ybI5SIOeJU7DSAu/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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