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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6026a1eebeffc63d7e5a8b0ee0dea59454f331fc725a7cb88d9e263316ff8e16' 
  AND token = 'UxasLjUr4XXaFsUP/bJuSBZ3RWRD7qPhqKA3pmLZh6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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