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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074f59f0b836b0b7afa35f607b3179423e049914d05465c68c6972173235fc16' 
  AND token = 'kCfKGiP3PWuV9DxoB0QTb2yg9i/N6QCqklnkcu8a4oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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