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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994724e52fd70cc0ecae4bc5ab108832598ef3228619906fc1aa26fae3932710' 
  AND token = 'zKzh5XWio2OA2Aa7nmEY4h7GpfmhNDyXu2QYkbolaAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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