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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd482b06c7a327cf54bab406ad748c2150ad6c9115f27a1855e9614a28b4dfccb' 
  AND token = 'wIHAa70Lgnq2vH87yYXA0lq0OP6x2DcivQyd/RUO6B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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