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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045c5fba556af8e7b542cfa2ac15f13a84175b964c784ff6aa2cfb32e3a419e6' 
  AND token = '8eEMJ26y9tVt8LRDB8cK6Pb1cQErcT9tX1CCH2ZgBJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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