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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e8e34f05f5ba704bf62599ca9388613af1cbdaf8b4b790a401fd00a6b17109' 
  AND token = 'sbEl95MdD3pTkUOVadzqnuiluvX/eBITIYA/pm47flE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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