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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590d96f13e9eed5d528d399b7962a65efab23501ba037b9a3e44385c5b2d8717' 
  AND token = 'rCSmP6Ue2s6GDzX0cDvn7eyP7VoCxHjP/kTQF4GGC/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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