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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b36b62760a3b7131a05d4dbfd45322bf8b7bbe685918b45ad6062af9831900' 
  AND token = 'obPCoL9fpuRn7L1V1+NsNKXjVKWpBk17nsJXteqKolA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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