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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14edc7722a796ddb8cc20cb2e9c7c4485c8f049a77d471968ce242570b41edad' 
  AND token = 'Dkg1XUMdRvr9bhaSUFN+0PrdKHFO+EPexbF8vFyHeAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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