SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58541c2dab753058102d5143845ba0c45d2b1adff21a32a89fdacb7a8669906d' 
  AND token = 'jikYKGztpI82q+2/0Q7BjxWnTcVcW19Ag9VGk68Khpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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