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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f585b089b037136deae62ac0e4739449af3c24c37f1d39af39d400f4afbbbea' 
  AND token = 'h5Fy53yFpGqiU53nH5pjaZd8q4kBeunmzf+IhvGQdGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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