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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bf15f4252d2538952232341cfa010fa51adc1f6a0c042e998db680c25c0017' 
  AND token = '9hhICYw/Yh1i83CERVTleIVnW79DT+fOyrnWKvEoTlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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