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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a16065c038fcdb6251f71d8ae69a41c5b7ee0eccdae18d9431b82d5694030b8' 
  AND token = '/TyJLv8ShHePv5PhNNLaHEht+WBpx9G/8UJ7UaC0A08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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