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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064c35be1f5c04a1b3a25f354b8a46b1295c7432c2d9fe022d86cdaeab426d49' 
  AND token = 'EZGmElEdwBcVM4iM4kFNzXylD9Q3TG/q5d8WmYYX6sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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