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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024d255963fd6fe4c0bee60d75c50ad587d9eea8d274c9e5b2b3aef5cef0bd15' 
  AND token = 'xpB2DdGvvdU5V4IW6udSMZUptRopASBIECkUySKxjUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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