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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03048337604915e962eae39775fd8d8147bcb7a80932554530e29be285a6d86' 
  AND token = 'VzW+uyinOOnE1dvNV6sirLWXXvUt8njhV8Ek6dd2gcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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