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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2dc4dd3e1c54531366e0f13d4b9e829b908dd42d889a7d4802d28776bde21e' 
  AND token = 'B/6822WB1lIAbR0a/HGhjgWsEd8jZLSv4xTr3je+ppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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