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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac93bdbf70a60841474ac0f5ffa87422f3cf7903a7fcaa07aa59fdd1d6d59cbb' 
  AND token = '+WnbH38QRUrBlJ5Y3ju4h+EKI9qmaFlHycS0GkVTrOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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