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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d4ce59065096e687949e06499c4a3c59e36f4270cd093dc40d6c4a9982aa89' 
  AND token = '3RsDgNGjykgt3RmphhgICGMnibl2+Bgkf0JLIrNTvhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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