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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c9ca26c9b823771bd3cfa3e8fac42ca31de046c0356e8a0c57e1919053c26b' 
  AND token = 'EAYfdGpkUH0+JF7pMqH7QNJZbpvTXuRooVTpGwPxElw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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