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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b834e8ab80936cdc6df8103c9d829e110f4794b40b0f9bee35552b16ff33b4ec' 
  AND token = 'KwioT8UtgOCIJwMWr//EZRb0O1IS3GmJyCvwJdOk5vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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