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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8330fb542d8afd3dd99049c6ceddf39199a894a17fd1bcfc9fa10484cdc29962' 
  AND token = 'tbNCK9+usk6vWbdNktIV6Gziv/OifvO+DHViWXf6n5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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