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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9c4fa13bfc001efc0e964ef1488cb24e5c173b38d82b8709487998871b8e01' 
  AND token = 'IYBF3H8Pp0ft9pSJJrNpmraH9Xiia470u4qQj5miWn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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