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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a237a9e154bab999fae39adefebee796915a327f7c892205c8aa663c1335263b' 
  AND token = 'eRaY1T74DvUpw0zHVsoZcw/rjSHb3UTUXC2haoyCcBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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