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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07399e27ffdb93b08254e6f5f7dc88ad85c4ed18b7b0f9ad0b03aed0d0bea6f2' 
  AND token = 'nngnGNB33OXFzWxSVZQyx/GL9njBetfumbxPwKWXNfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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