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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e4a8b4980d0faf553d55c9f335a7df42156b1ce175b16c71d8fd0a61d8ed6c' 
  AND token = 'sBAihU1s8PpjqdCPiddL/BEHprw/41oqiyl8aCdok20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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