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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258e6d218ad0b2d461f62fe0eaf86019bedf97eb38d8440d957aa076c8375647' 
  AND token = 'kJxBRcl0igMmR3GJ2ipqrswSyo8lF0A4viNgNfz2k6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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