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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0350f0b907d54774805dc511f7b8c48a7af2756d1639b318bae62cebb1599478' 
  AND token = 'V94+ItGMuaZTjYTEBmrUyfpuoXkOdp+7rcL/KME4OL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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