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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c827d034e2fe6e66169286c6c61c6c23d2f50503818f248d3974c9eb66d108f' 
  AND token = 'wPrr+DXifkM1/YpFQG624Ss4wg+6IpiRX9OrJ4SHijI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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