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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864c8e58232b310162d4127b9a13a273695fb939953858c60e98e55a30a06a5b' 
  AND token = 'mKXXrYUOJuMxErxH+ldrcbAG4FbvopCRepKouvG44/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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