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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8f3856515d87949bdae658b25f09fd9f33a1e154259d2db6e442739ab3c555' 
  AND token = 'euosBxOzQdycFtVJMkBhlESkdIw+x3Lkjw7ICSIDNq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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