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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa9abfcefa5ad457a4b453dc283ca9c893effee2e53de97cd23c81aeaaac94d' 
  AND token = 'uqMlEwq9waubE/2rrBdR36fKU6eXLcWc3y/5i4/X+5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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