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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc384d144d0ee1130b5cd4f595dc34ce8a16a060002f9dd7e835a12b9ef745c7' 
  AND token = 'bMFpmwNPkTaKEWKcP8y6El89kg+rQLeKI9waKkJRZso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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