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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882e739b77081edd148037f132116e5300a5cb29054d6ce625900506309d70d4' 
  AND token = 'Ibt+A9D+Yxmjc8jsU+Qnfw5CnRyC2DqhCq6RgxIVIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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